Flow control device for power steering



PURPOSE: To suppress the response delay of a spool valve by communicating the front and rear of an orifice with each other by a bypass valve so as to quickly relax pressure difference when the spring chamber pressure of a flow regulating spool valve exceeds the lower reaches pressure of a throttle passage due to excessive flow. CONSTITUTION: A flow control device receiving the discharge oil of a pump into a feed port 13 and feeding it to a power steering from a control port 17 is provided with a throttle member 3 with a first orifice 31 formed opposedly to the right end 21 of a spool 2, and the lower reaches of the orifice 31 is communicated with a second valve chamber 12. The flow control device is also provided with a lead passage 4 with a second orifice 41 formed, and a by-pass passage 42 making detour around the second orifice 41. In the case of pressure in the second valve chamber 12 rising abnormally, a relief valve 6 is opened, and the spool 2 is operated so that the pressure effect of the first orifice 31 is generated only by the part corresponding to pressure effect at the second orifice 41 to limit pressure rise to a control line. COPYRIGHT: (C)1996,JPO
(57)【要約】 【目的】 過渡流量が流入した時のスプール弁の応答遅 れに伴って過大流量の制御ラインへの流れおよび低温時 におけるピーク状のサージ圧の発生を防止すること。 【構成】 シリンダ室10と供給口13と排出口14が 形成された弁本体1の前記シリンダ室10内に介挿され 前記シリンダ室10の左右端との間に第1および第2の 弁室11、12を形成するスプール2と、該スプール2 の右端21に対向して配設され第1のオリフィス31が 形成された絞り部材3と、前記第1のオリフィス31の 下流とバネ室を構成する前記第2弁室12とを連通する とともに第2のオリフィス41が形成された導圧通路4 と、該第2のオリフィス41の前後を連通するバイパス 流路42に配設された逆止弁5と、前記スプール2の内 部に前記第2の弁室に連通して配設されたリリーフ弁6 とから成る動力舵取装置の流量制御装置。




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